[PATCH for-5.1] libvhost-user: Add missing GCC_FMT_ATTR and fix format errors

[Stefan Weil]

Signed-off-by: Stefan Weil <sw@weilnetz.de>
---
 contrib/libvhost-user/libvhost-user.c | 9 +++++----
 1 file changed, 5 insertions(+), 4 deletions(-)

diff --git a/contrib/libvhost-user/libvhost-user.c 
b/contrib/libvhost-user/libvhost-user.c
index d315db1396..6e659aff37 100644
--- a/contrib/libvhost-user/libvhost-user.c
+++ b/contrib/libvhost-user/libvhost-user.c
@@ -151,7 +151,7 @@ vu_request_to_string(unsigned int req)
     }
 }
 
-static void
+static void GCC_FMT_ATTR(2, 3)
 vu_panic(VuDev *dev, const char *msg, ...)
 {
     char *buf = NULL;
@@ -2074,7 +2074,7 @@ virtqueue_get_head(VuDev *dev, VuVirtq *vq,
 
     /* If their number is silly, that's a fatal mistake. */
     if (*head >= vq->vring.num) {
-        vu_panic(dev, "Guest says index %u is available", head);
+        vu_panic(dev, "Guest says index %u is available", *head);
         return false;
     }
 
@@ -2133,7 +2133,7 @@ virtqueue_read_next_desc(VuDev *dev, struct vring_desc 
*desc,
     smp_wmb();
 
     if (*next >= max) {
-        vu_panic(dev, "Desc next is %u", next);
+        vu_panic(dev, "Desc next is %u", *next);
         return VIRTQUEUE_READ_DESC_ERROR;
     }
 
-- 
2.27.0